1 /* vi: set sw=4 ts=4: */
3 * Mini unzip implementation for busybox
5 * Copyright (C) 2004 by Ed Clark
7 * Loosely based on original busybox unzip applet by Laurence Anderson.
8 * All options and features should work in this version.
10 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
13 * http://www.pkware.com/company/standards/appnote/
14 * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
17 * Zip64 + other methods
20 //config: bool "unzip (24 kb)"
23 //config: unzip will list or extract files from a ZIP archive,
24 //config: commonly found on DOS/WIN systems. The default behavior
25 //config: (with no options) is to extract the archive into the
26 //config: current directory.
28 //config:config FEATURE_UNZIP_CDF
29 //config: bool "Read and use Central Directory data"
31 //config: depends on UNZIP
33 //config: If you know that you only need to deal with simple
34 //config: ZIP files without deleted/updated files, SFX archives etc,
35 //config: you can reduce code size by unselecting this option.
36 //config: To support less trivial ZIPs, say Y.
38 //config:config FEATURE_UNZIP_BZIP2
39 //config: bool "Support compression method 12 (bzip2)"
41 //config: depends on FEATURE_UNZIP_CDF && DESKTOP
42 // FEATURE_UNZIP_CDF is needed, otherwise we can't find start of next file
43 // DESKTOP is needed to get back uncompressed length
45 //config:config FEATURE_UNZIP_LZMA
46 //config: bool "Support compression method 14 (lzma)"
48 //config: depends on FEATURE_UNZIP_CDF && DESKTOP
50 //config:config FEATURE_UNZIP_XZ
51 //config: bool "Support compression method 95 (xz)"
53 //config: depends on FEATURE_UNZIP_CDF && DESKTOP
55 //applet:IF_UNZIP(APPLET(unzip, BB_DIR_USR_BIN, BB_SUID_DROP))
56 //kbuild:lib-$(CONFIG_UNZIP) += unzip.o
58 //usage:#define unzip_trivial_usage
59 //usage: "[-lnopq] FILE[.zip] [FILE]... [-x FILE...] [-d DIR]"
60 //usage:#define unzip_full_usage "\n\n"
61 //usage: "Extract FILEs from ZIP archive\n"
62 //usage: "\n -l List contents (with -q for short form)"
63 //usage: "\n -n Never overwrite files (default: ask)"
64 //usage: "\n -o Overwrite"
65 //usage: "\n -j Do not restore paths"
66 //usage: "\n -p Print to stdout"
67 //usage: "\n -q Quiet"
68 //usage: "\n -x FILE Exclude FILEs"
69 //usage: "\n -d DIR Extract into DIR"
72 #include "bb_archive.h"
75 # define dbg(...) bb_error_msg(__VA_ARGS__)
77 # define dbg(...) ((void)0)
82 ZIP_FILEHEADER_MAGIC = 0x504b0304,
83 ZIP_CDF_MAGIC = 0x504b0102, /* CDF item */
84 ZIP_CDE_MAGIC = 0x504b0506, /* End of CDF */
85 ZIP_DD_MAGIC = 0x504b0708,
87 ZIP_FILEHEADER_MAGIC = 0x04034b50,
88 ZIP_CDF_MAGIC = 0x02014b50,
89 ZIP_CDE_MAGIC = 0x06054b50,
90 ZIP_DD_MAGIC = 0x08074b50,
94 #define ZIP_HEADER_LEN 26
97 uint8_t raw[ZIP_HEADER_LEN];
99 uint16_t version; /* 0-1 */
100 uint16_t zip_flags; /* 2-3 */
101 uint16_t method; /* 4-5 */
102 uint16_t modtime; /* 6-7 */
103 uint16_t moddate; /* 8-9 */
104 uint32_t crc32 PACKED; /* 10-13 */
105 uint32_t cmpsize PACKED; /* 14-17 */
106 uint32_t ucmpsize PACKED; /* 18-21 */
107 uint16_t filename_len; /* 22-23 */
108 uint16_t extra_len; /* 24-25 */
109 /* filename follows (not NUL terminated) */
110 /* extra field follows */
113 } zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */
115 #define FIX_ENDIANNESS_ZIP(zip) \
116 do { if (BB_BIG_ENDIAN) { \
117 (zip).fmt.method = SWAP_LE16((zip).fmt.method ); \
118 (zip).fmt.crc32 = SWAP_LE32((zip).fmt.crc32 ); \
119 (zip).fmt.cmpsize = SWAP_LE32((zip).fmt.cmpsize ); \
120 (zip).fmt.ucmpsize = SWAP_LE32((zip).fmt.ucmpsize ); \
121 (zip).fmt.filename_len = SWAP_LE16((zip).fmt.filename_len); \
122 (zip).fmt.extra_len = SWAP_LE16((zip).fmt.extra_len ); \
125 #define CDF_HEADER_LEN 42
128 uint8_t raw[CDF_HEADER_LEN];
130 /* uint32_t signature; 50 4b 01 02 */
131 uint16_t version_made_by; /* 0-1 */
132 uint16_t version_needed; /* 2-3 */
133 uint16_t cdf_flags; /* 4-5 */
134 uint16_t method; /* 6-7 */
135 uint16_t modtime; /* 8-9 */
136 uint16_t moddate; /* 10-11 */
137 uint32_t crc32; /* 12-15 */
138 uint32_t cmpsize; /* 16-19 */
139 uint32_t ucmpsize; /* 20-23 */
140 uint16_t filename_len; /* 24-25 */
141 uint16_t extra_len; /* 26-27 */
142 uint16_t file_comment_length; /* 28-29 */
143 uint16_t disk_number_start; /* 30-31 */
144 uint16_t internal_attributes; /* 32-33 */
145 uint32_t external_attributes PACKED; /* 34-37 */
146 uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
147 /* filename follows (not NUL terminated) */
148 /* extra field follows */
149 /* file comment follows */
153 #define FIX_ENDIANNESS_CDF(cdf) \
154 do { if (BB_BIG_ENDIAN) { \
155 (cdf).fmt.version_made_by = SWAP_LE16((cdf).fmt.version_made_by); \
156 (cdf).fmt.version_needed = SWAP_LE16((cdf).fmt.version_needed); \
157 (cdf).fmt.method = SWAP_LE16((cdf).fmt.method ); \
158 (cdf).fmt.modtime = SWAP_LE16((cdf).fmt.modtime ); \
159 (cdf).fmt.moddate = SWAP_LE16((cdf).fmt.moddate ); \
160 (cdf).fmt.crc32 = SWAP_LE32((cdf).fmt.crc32 ); \
161 (cdf).fmt.cmpsize = SWAP_LE32((cdf).fmt.cmpsize ); \
162 (cdf).fmt.ucmpsize = SWAP_LE32((cdf).fmt.ucmpsize ); \
163 (cdf).fmt.filename_len = SWAP_LE16((cdf).fmt.filename_len); \
164 (cdf).fmt.extra_len = SWAP_LE16((cdf).fmt.extra_len ); \
165 (cdf).fmt.file_comment_length = SWAP_LE16((cdf).fmt.file_comment_length); \
166 (cdf).fmt.external_attributes = SWAP_LE32((cdf).fmt.external_attributes); \
172 uint8_t raw[CDE_LEN];
174 /* uint32_t signature; 50 4b 05 06 */
175 uint16_t this_disk_no;
176 uint16_t disk_with_cdf_no;
177 uint16_t cdf_entries_on_this_disk;
178 uint16_t cdf_entries_total;
181 /* uint16_t archive_comment_length; */
182 /* archive comment follows */
186 #define FIX_ENDIANNESS_CDE(cde) \
187 do { if (BB_BIG_ENDIAN) { \
188 (cde).fmt.cdf_offset = SWAP_LE32((cde).fmt.cdf_offset); \
192 /* Check the offset of the last element, not the length. This leniency
193 * allows for poor packing, whereby the overall struct may be too long,
194 * even though the elements are all in the right place.
196 char BUG_zip_header_must_be_26_bytes[
197 offsetof(zip_header_t, fmt.extra_len) + 2
198 == ZIP_HEADER_LEN ? 1 : -1];
199 char BUG_cdf_header_must_be_42_bytes[
200 offsetof(cdf_header_t, fmt.relative_offset_of_local_header) + 4
201 == CDF_HEADER_LEN ? 1 : -1];
202 char BUG_cde_must_be_16_bytes[
203 sizeof(cde_t) == CDE_LEN ? 1 : -1];
210 /* This value means that we failed to find CDF */
211 #define BAD_CDF_OFFSET ((uint32_t)0xffffffff)
213 #if !ENABLE_FEATURE_UNZIP_CDF
215 # define find_cdf_offset() BAD_CDF_OFFSET
219 * Self-extracting PRO2K3XP_32.exe contains 19078464 byte zip archive,
220 * where CDE was nearly 48 kbytes before EOF.
221 * (Surprisingly, it also apparently has *another* CDE structure
222 * closer to the end, with bogus cdf_offset).
223 * To make extraction work, bumped PEEK_FROM_END from 16k to 64k.
225 #define PEEK_FROM_END (64*1024)
226 /* NB: does not preserve file position! */
227 static uint32_t find_cdf_offset(void)
235 end = lseek(zip_fd, 0, SEEK_END);
236 if (end == (off_t) -1)
237 return BAD_CDF_OFFSET;
239 end -= PEEK_FROM_END;
243 dbg("Looking for cdf_offset starting from 0x%"OFF_FMT"x", end);
244 xlseek(zip_fd, end, SEEK_SET);
245 buf = xzalloc(PEEK_FROM_END);
246 full_read(zip_fd, buf, PEEK_FROM_END);
248 found = BAD_CDF_OFFSET;
250 while (p <= buf + PEEK_FROM_END - CDE_LEN - 4) {
262 memcpy(cde.raw, p + 1, CDE_LEN);
263 FIX_ENDIANNESS_CDE(cde);
265 * I've seen .ZIP files with seemingly valid CDEs
266 * where cdf_offset points past EOF - ??
267 * This check ignores such CDEs:
269 if (cde.fmt.cdf_offset < end + (p - buf)) {
270 found = cde.fmt.cdf_offset;
271 dbg("Possible cdf_offset:0x%x at 0x%"OFF_FMT"x",
272 (unsigned)found, end + (p-3 - buf));
273 dbg(" cdf_offset+cdf_size:0x%x",
274 (unsigned)(found + SWAP_LE32(cde.fmt.cdf_size)));
276 * We do not "break" here because only the last CDE is valid.
277 * I've seen a .zip archive which contained a .zip file,
278 * uncompressed, and taking the first CDE was using
279 * the CDE inside that file!
284 dbg("Found cdf_offset:0x%x", (unsigned)found);
288 static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf)
292 if (cdf_offset == BAD_CDF_OFFSET)
295 dbg("Reading CDF at 0x%x", (unsigned)cdf_offset);
296 xlseek(zip_fd, cdf_offset, SEEK_SET);
297 xread(zip_fd, &magic, 4);
298 /* Central Directory End? Assume CDF has ended.
299 * (more correct method is to use cde.cdf_entries_total counter)
301 if (magic == ZIP_CDE_MAGIC) {
302 dbg("got ZIP_CDE_MAGIC");
305 xread(zip_fd, cdf->raw, CDF_HEADER_LEN);
307 FIX_ENDIANNESS_CDF(*cdf);
308 dbg(" filename_len:%u extra_len:%u file_comment_length:%u",
309 (unsigned)cdf->fmt.filename_len,
310 (unsigned)cdf->fmt.extra_len,
311 (unsigned)cdf->fmt.file_comment_length
313 cdf_offset += 4 + CDF_HEADER_LEN
314 + cdf->fmt.filename_len
316 + cdf->fmt.file_comment_length;
322 static void die_if_bad_fnamesize(unsigned sz)
324 if (sz > 0xfff) /* more than 4k?! no funny business please */
325 bb_error_msg_and_die("bad archive");
328 static void unzip_skip(off_t skip)
331 if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
332 bb_copyfd_exact_size(zip_fd, -1, skip);
335 static void unzip_create_leading_dirs(const char *fn)
337 /* Create all leading directories */
338 char *name = xstrdup(fn);
339 if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
340 xfunc_die(); /* bb_make_directory is noisy */
345 #if ENABLE_FEATURE_UNZIP_CDF
346 static void unzip_extract_symlink(zip_header_t *zip, const char *dst_fn)
350 die_if_bad_fnamesize(zip->fmt.ucmpsize);
352 if (zip->fmt.method == 0) {
353 /* Method 0 - stored (not compressed) */
354 target = xzalloc(zip->fmt.ucmpsize + 1);
355 xread(zip_fd, target, zip->fmt.ucmpsize);
358 bb_error_msg_and_die("compressed symlink is not supported");
360 transformer_state_t xstate;
361 init_transformer_state(&xstate);
362 xstate.mem_output_size_max = zip->fmt.ucmpsize;
364 if (!xstate.mem_output_buf)
366 target = xstate.mem_output_buf;
367 target = xrealloc(target, xstate.mem_output_size + 1);
368 target[xstate.mem_output_size] = '\0';
371 if (!unsafe_symlink_target(target)) {
372 //TODO: libbb candidate
373 if (symlink(target, dst_fn)) {
375 bb_perror_msg_and_die("can't create %slink '%s' to '%s'",
376 "sym", dst_fn, target
384 static void unzip_extract(zip_header_t *zip, int dst_fd)
386 transformer_state_t xstate;
388 if (zip->fmt.method == 0) {
389 /* Method 0 - stored (not compressed) */
390 off_t size = zip->fmt.ucmpsize;
392 bb_copyfd_exact_size(zip_fd, dst_fd, size);
396 init_transformer_state(&xstate);
397 xstate.bytes_in = zip->fmt.cmpsize;
398 xstate.src_fd = zip_fd;
399 xstate.dst_fd = dst_fd;
400 if (zip->fmt.method == 8) {
401 /* Method 8 - inflate */
402 if (inflate_unzip(&xstate) < 0)
403 bb_error_msg_and_die("inflate error");
404 /* Validate decompression - crc */
405 if (zip->fmt.crc32 != (xstate.crc32 ^ 0xffffffffL)) {
406 bb_error_msg_and_die("crc error");
409 #if ENABLE_FEATURE_UNZIP_BZIP2
410 else if (zip->fmt.method == 12) {
411 /* Tested. Unpacker reads too much, but we use CDF
412 * and will seek to the correct beginning of next file.
414 xstate.bytes_out = unpack_bz2_stream(&xstate);
415 if (xstate.bytes_out < 0)
416 bb_error_msg_and_die("inflate error");
419 #if ENABLE_FEATURE_UNZIP_LZMA
420 else if (zip->fmt.method == 14) {
422 xstate.bytes_out = unpack_lzma_stream(&xstate);
423 if (xstate.bytes_out < 0)
424 bb_error_msg_and_die("inflate error");
427 #if ENABLE_FEATURE_UNZIP_XZ
428 else if (zip->fmt.method == 95) {
430 xstate.bytes_out = unpack_xz_stream(&xstate);
431 if (xstate.bytes_out < 0)
432 bb_error_msg_and_die("inflate error");
436 bb_error_msg_and_die("unsupported method %u", zip->fmt.method);
439 /* Validate decompression - size */
440 if (zip->fmt.ucmpsize != xstate.bytes_out) {
441 /* Don't die. Who knows, maybe len calculation
442 * was botched somewhere. After all, crc matched! */
443 bb_error_msg("bad length");
447 static void my_fgets80(char *buf80)
450 if (!fgets(buf80, 80, stdin)) {
451 bb_perror_msg_and_die("can't read standard input");
455 static int get_lstat_mode(const char *dst_fn)
457 struct stat stat_buf;
458 if (lstat(dst_fn, &stat_buf) == -1) {
459 if (errno != ENOENT) {
460 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
462 /* File does not exist */
465 return stat_buf.st_mode;
468 int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
469 int unzip_main(int argc, char **argv)
478 IF_NOT_FEATURE_UNZIP_CDF(const) smallint verbose = 0;
479 enum { O_PROMPT, O_NEVER, O_ALWAYS };
480 smallint overwrite = O_PROMPT;
482 unsigned long total_usize;
483 unsigned long total_size;
484 unsigned total_entries;
488 llist_t *zaccept = NULL;
489 llist_t *zreject = NULL;
490 char *base_dir = NULL;
492 char key_buf[80]; /* must match size used by my_fgets80 */
494 /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
496 * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
497 * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
498 * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
499 * Length Method Size Ratio Date Time CRC-32 Name
500 * -------- ------ ------- ----- ---- ---- ------ ----
501 * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
502 * -------- ------- --- -------
503 * 204372 35278 83% 1 file
504 * # /usr/bin/unzip -v decompress_unlzma.i.zip
505 * Archive: decompress_unlzma.i.zip
506 * Length Method Size Ratio Date Time CRC-32 Name
507 * -------- ------ ------- ----- ---- ---- ------ ----
508 * 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
509 * -------- ------- --- -------
510 * 204372 35278 83% 1 file
511 * # unzip -v decompress_unlzma.i.zip
512 * Archive: decompress_unlzma.i.zip
513 * Length Date Time Name
514 * -------- ---- ---- ----
515 * 204372 09-06-09 14:23 decompress_unlzma.i
518 * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
519 * 204372 09-06-09 14:23 decompress_unlzma.i
520 * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
521 * Length Date Time Name
522 * -------- ---- ---- ----
523 * 204372 09-06-09 14:23 decompress_unlzma.i
526 * # /usr/bin/unzip -l decompress_unlzma.i.zip
527 * Archive: decompress_unlzma.i.zip
528 * Length Date Time Name
529 * -------- ---- ---- ----
530 * 204372 09-06-09 14:23 decompress_unlzma.i
536 /* '-' makes getopt return 1 for non-options */
537 while ((i = getopt(argc, argv, "-d:lnopqxjv")) != -1) {
539 case 'd': /* Extract to base directory */
547 case 'n': /* Never overwrite existing files */
551 case 'o': /* Always overwrite existing files */
552 overwrite = O_ALWAYS;
555 case 'p': /* Extract files to stdout and fall through to set verbosity */
556 dst_fd = STDOUT_FILENO;
558 case 'q': /* Be quiet */
562 case 'v': /* Verbose list */
563 IF_FEATURE_UNZIP_CDF(verbose++;)
578 /* +5: space for ".zip" and NUL */
579 src_fn = xmalloc(strlen(optarg) + 5);
580 strcpy(src_fn, optarg);
581 } else if (!(opts & OPT_x)) {
583 llist_add_to(&zaccept, optarg);
586 llist_add_to(&zreject, optarg);
597 * This code is needed for non-GNU getopt
598 * which doesn't understand "-" in option string.
599 * The -x option won't work properly in this case:
600 * "unzip a.zip q -x w e" will be interpreted as
601 * "unzip a.zip q w e -x" = "unzip a.zip q w e"
605 /* +5: space for ".zip" and NUL */
606 src_fn = xmalloc(strlen(argv[0]) + 5);
607 strcpy(src_fn, argv[0]);
609 llist_add_to(&zaccept, *argv);
617 /* Open input file */
618 if (LONE_DASH(src_fn)) {
619 xdup2(STDIN_FILENO, zip_fd);
620 /* Cannot use prompt mode since zip data is arriving on STDIN */
621 if (overwrite == O_PROMPT)
624 static const char extn[][5] ALIGN1 = { ".zip", ".ZIP" };
625 char *ext = src_fn + strlen(src_fn);
630 src_fd = open(src_fn, O_RDONLY);
635 bb_error_msg_and_die("can't open %s[.zip]", src_fn);
637 strcpy(ext, extn[i - 1]);
639 xmove_fd(src_fd, zip_fd);
642 /* Change dir if necessary */
646 if (quiet <= 1) { /* not -qq */
648 printf("Archive: %s\n", src_fn);
651 " Length Method Size Cmpr Date Time CRC-32 Name\n"
652 "-------- ------ ------- ---- ---------- ----- -------- ----"
654 " Length Date Time Name\n"
655 "--------- ---------- ----- ----"
660 /* Example of an archive with one 0-byte long file named 'z'
661 * created by Zip 2.31 on Unix:
662 * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
663 * sig........ vneed flags compr mtime mdate crc32>
664 * 0010 00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
665 * >..... csize...... usize...... fnlen exlen fn ex>
666 * 0020 54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
667 * >tra_field......................................
668 * 0030 00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
669 * ........... sig........ vmade vneed flags compr
670 * 0040 42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
671 * mtime mdate crc32...... csize...... usize......
672 * 0050 01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
673 * fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
674 * 0060 00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
675 * >..... fn extra_field...........................
676 * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
677 * 0080 34 00 00 00 00 00 |4.....|
682 cdf_offset = find_cdf_offset(); /* try to seek to the end, find CDE and CDF start */
685 mode_t dir_mode = 0777;
686 #if ENABLE_FEATURE_UNZIP_CDF
687 mode_t file_mode = 0666;
690 if (!ENABLE_FEATURE_UNZIP_CDF || cdf_offset == BAD_CDF_OFFSET) {
691 /* Normally happens when input is unseekable.
693 * Valid ZIP file has Central Directory at the end
694 * with central directory file headers (CDFs).
695 * After it, there is a Central Directory End structure.
696 * CDFs identify what files are in the ZIP and where
697 * they are located. This allows ZIP readers to load
698 * the list of files without reading the entire ZIP archive.
699 * ZIP files may be appended to, only files specified in
700 * the CD are valid. Scanning for local file headers is
701 * not a correct algorithm.
703 * We try to do the above, and resort to "linear" reading
704 * of ZIP file only if seek failed or CDE wasn't found.
708 /* Check magic number */
709 xread(zip_fd, &magic, 4);
710 /* CDF item? Assume there are no more files, exit */
711 if (magic == ZIP_CDF_MAGIC) {
712 dbg("got ZIP_CDF_MAGIC");
715 /* Data descriptor? It was a streaming file, go on */
716 if (magic == ZIP_DD_MAGIC) {
717 dbg("got ZIP_DD_MAGIC");
718 /* skip over duplicate crc32, cmpsize and ucmpsize */
722 if (magic != ZIP_FILEHEADER_MAGIC)
723 bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
724 dbg("got ZIP_FILEHEADER_MAGIC");
726 xread(zip_fd, zip.raw, ZIP_HEADER_LEN);
727 FIX_ENDIANNESS_ZIP(zip);
728 if (zip.fmt.zip_flags & SWAP_LE16(0x0008)) {
729 bb_error_msg_and_die("zip flag %s is not supported",
733 #if ENABLE_FEATURE_UNZIP_CDF
735 /* cdf_offset is valid (and we know the file is seekable) */
737 cdf_offset = read_next_cdf(cdf_offset, &cdf);
738 if (cdf_offset == 0) /* EOF? */
742 SWAP_LE32(cdf.fmt.relative_offset_of_local_header) + 4,
744 xread(zip_fd, zip.raw, ZIP_HEADER_LEN);
745 FIX_ENDIANNESS_ZIP(zip);
746 if (zip.fmt.zip_flags & SWAP_LE16(0x0008)) {
747 /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
748 * only from Central Directory.
750 zip.fmt.crc32 = cdf.fmt.crc32;
751 zip.fmt.cmpsize = cdf.fmt.cmpsize;
752 zip.fmt.ucmpsize = cdf.fmt.ucmpsize;
754 // Seen in some zipfiles: central directory 9 byte extra field contains
755 // a subfield with ID 0x5455 and 5 data bytes, which is a Unix-style UTC mtime.
756 // Local header version:
758 // u16 size (1 + 4 * n)
759 // u8 flags: bit 0:mtime is present, bit 1:atime is present, bit 2:ctime is present
763 // Central header version:
765 // u16 size (5 (or 1?))
766 // u8 flags: bit 0:mtime is present, bit 1:atime is present, bit 2:ctime is present
767 // u32 mtime (CDF does not store atime/ctime)
769 /* CDF has the same data as local header, no need to read the latter...
770 * ...not really. An archive was seen with cdf.extra_len == 6 but
771 * zip.extra_len == 0.
773 memcpy(&zip.fmt.version,
774 &cdf.fmt.version_needed, ZIP_HEADER_LEN);
776 SWAP_LE32(cdf.fmt.relative_offset_of_local_header) + 4 + ZIP_HEADER_LEN,
779 if ((cdf.fmt.version_made_by >> 8) == 3) {
780 /* This archive is created on Unix */
781 dir_mode = file_mode = (cdf.fmt.external_attributes >> 16);
786 if (zip.fmt.zip_flags & SWAP_LE16(0x0001)) {
787 /* 0x0001 - encrypted */
788 bb_error_msg_and_die("zip flag %s is not supported",
791 dbg("File cmpsize:0x%x extra_len:0x%x ucmpsize:0x%x",
792 (unsigned)zip.fmt.cmpsize,
793 (unsigned)zip.fmt.extra_len,
794 (unsigned)zip.fmt.ucmpsize
799 die_if_bad_fnamesize(zip.fmt.filename_len);
800 dst_fn = xzalloc(zip.fmt.filename_len + 1);
801 xread(zip_fd, dst_fn, zip.fmt.filename_len);
802 /* Skip extra header bytes */
803 unzip_skip(zip.fmt.extra_len);
805 /* Guard against "/abspath", "/../" and similar attacks */
806 overlapping_strcpy(dst_fn, strip_unsafe_prefix(dst_fn));
808 if (opts & OPT_j) /* Strip paths? */
809 overlapping_strcpy(dst_fn, bb_basename(dst_fn));
811 /* Did this strip everything ("DIR/" case)? Then skip */
815 /* Filter zip entries */
816 if (find_list_entry(zreject, dst_fn)
817 || (zaccept && !find_list_entry(zaccept, dst_fn))
824 char dtbuf[sizeof("mm-dd-yyyy hh:mm")];
825 sprintf(dtbuf, "%02u-%02u-%04u %02u:%02u",
826 (zip.fmt.moddate >> 5) & 0xf, // mm: 0x01e0
827 (zip.fmt.moddate) & 0x1f, // dd: 0x001f
828 (zip.fmt.moddate >> 9) + 1980, // yy: 0xfe00
829 (zip.fmt.modtime >> 11), // hh: 0xf800
830 (zip.fmt.modtime >> 5) & 0x3f // mm: 0x07e0
831 // seconds/2 not shown, encoded in -- 0x001f
834 // " Length Date Time Name\n"
835 // "--------- ---------- ----- ----"
836 printf( "%9u " "%s " "%s\n",
837 (unsigned)zip.fmt.ucmpsize,
842 unsigned long percents;
844 sprintf(method6, "%6u", zip.fmt.method);
845 if (zip.fmt.method == 0) {
846 strcpy(method6, "Stored");
848 if (zip.fmt.method == 8) {
849 strcpy(method6, "Defl:N");
850 /* normal, maximum, fast, superfast */
851 IF_DESKTOP(method6[5] = "NXFS"[(zip.fmt.zip_flags >> 1) & 3];)
853 percents = zip.fmt.ucmpsize - zip.fmt.cmpsize;
854 if ((int32_t)percents < 0)
855 percents = 0; /* happens if ucmpsize < cmpsize */
856 percents = percents * 100;
857 if (zip.fmt.ucmpsize)
858 percents /= zip.fmt.ucmpsize;
859 // " Length Method Size Cmpr Date Time CRC-32 Name\n"
860 // "-------- ------ ------- ---- ---------- ----- -------- ----"
861 printf( "%8u %s" "%9u%4u%% " "%s " "%08x " "%s\n",
862 (unsigned)zip.fmt.ucmpsize,
864 (unsigned)zip.fmt.cmpsize,
869 total_size += zip.fmt.cmpsize;
871 total_usize += zip.fmt.ucmpsize;
875 if (dst_fd == STDOUT_FILENO) {
876 /* Extracting to STDOUT */
879 if (last_char_is(dst_fn, '/')) {
882 /* Extract directory */
883 mode = get_lstat_mode(dst_fn);
884 if (mode == -1) { /* ENOENT */
886 printf(" creating: %s\n", dst_fn);
888 unzip_create_leading_dirs(dst_fn);
889 if (bb_make_directory(dst_fn, dir_mode, FILEUTILS_IGNORE_CHMOD_ERR)) {
893 if (!S_ISDIR(mode)) {
894 bb_error_msg_and_die("'%s' exists but is not a %s",
895 dst_fn, "directory");
901 /* Does target file already exist? */
903 int mode = get_lstat_mode(dst_fn);
905 /* ENOENT: does not exist */
906 goto do_open_and_extract;
908 if (overwrite == O_NEVER) {
911 if (!S_ISREG(mode)) {
913 bb_error_msg_and_die("'%s' exists but is not a %s",
914 dst_fn, "regular file");
916 if (overwrite == O_ALWAYS) {
917 goto do_open_and_extract;
919 printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
921 /* User input could take a long time. Is it still a regular file? */
922 mode = get_lstat_mode(dst_fn);
927 /* Extract (or skip) it */
928 switch (key_buf[0]) {
930 overwrite = O_ALWAYS;
931 case 'y': /* Open file and fall into unzip */
933 unzip_create_leading_dirs(dst_fn);
934 #if ENABLE_FEATURE_UNZIP_CDF
936 if (!S_ISLNK(file_mode)) {
937 dst_fd = xopen3(dst_fn,
938 O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW,
942 /* O_NOFOLLOW defends against symlink attacks */
943 dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW);
947 printf(/* zip.fmt.method == 0
948 ? " extracting: %s\n"
949 : */ " inflating: %s\n", dst_fn);
951 #if ENABLE_FEATURE_UNZIP_CDF
952 if (S_ISLNK(file_mode)) {
953 if (dst_fd != STDOUT_FILENO) /* not -p? */
954 unzip_extract_symlink(&zip, dst_fn);
958 unzip_extract(&zip, dst_fd);
959 if (dst_fd != STDOUT_FILENO) {
960 /* closing STDOUT is potentially bad for future business */
968 case 'n': /* Skip entry data */
970 unzip_skip(zip.fmt.cmpsize);
974 /* Prompt for new name */
975 printf("new name: ");
978 dst_fn = xstrdup(key_buf);
983 printf("error: invalid response [%c]\n", (char)key_buf[0]);
990 if ((opts & OPT_l) && quiet <= 1) {
992 // " Length Date Time Name\n"
993 // "--------- ---------- ----- ----"
994 printf( " --------%21s" "-------\n"
995 "%9lu%21s" "%u files\n",
997 total_usize, "", total_entries);
999 unsigned long percents = total_usize - total_size;
1000 if ((long)percents < 0)
1001 percents = 0; /* happens if usize < size */
1002 percents = percents * 100;
1004 percents /= total_usize;
1005 // " Length Method Size Cmpr Date Time CRC-32 Name\n"
1006 // "-------- ------ ------- ---- ---------- ----- -------- ----"
1007 printf( "-------- ------- ----%28s" "----\n"
1008 "%8lu" "%17lu%4u%%%28s" "%u files\n",
1010 total_usize, total_size, (unsigned)percents, "",